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I have the immitiation but that makes the coollinghoses flat/vaccuum after a drive around. i've put back on the oem one and no problems anymore
Sorry, I must half been half asleep when I replied. I can't tell you what the difference is but I bought mine from the same chap as in the first link you supllied.
just put a new radiator on my car yesterday! it had cracked and started to leak in a few places,this was since having a sti 1.3bar rad cap on instead of a standard one which i reckon was the culprit!!!! standard rad and hoses was eventually too much strain for higher boiling point cap.